ECYD is the Regnum Christi Charism lived by adolescents in middle school and high school.

Through ECYD, Legionaries—alongside other Regnum Christi members—offer adolescents transformative encounters with Jesus Christ. From these encounters, the adolescent then forms convictions that become pillars of their identities. These convictions impel them to make decisions in all areas of their lives. ECYD members live their mission by taking advantage of every occasion to collaborate with Christ in making his Kingdom present and by giving witness to an authentic Christian life of self-giving.

ECYD offers camps, missions, and adventures, as well as teams of like-minded youth who meet regularly to pray and transform the world around them as apostles.